web site,,,just google,,,will give loads of info...I also get guidebooks at library for each region,,,for some large cities I even BUY one I ve looked at from Amazon or etc...and take portions with me..we usually do own excursions,,,unless ones we like inc...and even then will leave and go on own once in city,,but always let guide know.Since you dock right in town,,ususally,,easy to walk on and off.We love HOHO buses,,some hate them,,but for $35 or so can see town and sites rather than take bus,tour,etc..most big ports have them..will tell you where to pick up on either of above ways...we love river tours,have taken 8..have another planned next June on Ama...Budapest to Prague...and have already done lots of planning..any specific questions...have been from Amsterdam to Germany..on Avalon once for France...good luck.